scholarly journals Comparative Pathology of Experimental Avibacterium Paragallinarum Infection in Chicken and Japanese Quail

2021 ◽  
Author(s):  
Aadish Balouria ◽  
Sidhartha Deshmukh ◽  
Harmanjit Singh Banga ◽  
Milind Madhukar Chawak ◽  
Shakti Kant Dash ◽  
...  
Keyword(s):  
Animal Model ◽  
Immune Responses ◽  
Japanese Quail ◽  
Clinical Signs ◽  
Host Susceptibility ◽  
Upper Respiratory Tract ◽  
Infectious Coryza ◽  
Avibacterium Paragallinarum ◽  
Upper Respiratory ◽  
Mucosal Immune Responses

Abstract IntroductionAvibacterium paragallinarum (Av.paragallinarum) is the causative agent of infectious coryza (IC) in chicken, an economically devastating disease of poultry industry. Despite the availability of effective vaccines against IC, the infection is rampant in unorganized poultry sector. Moreover, reports of wider host susceptibility in poultry farms and under field conditions are also emerging. Av.paragallinarum affects the upper respiratory tract of birds and has a predilection for the nasal turbinates. However, no study has systematically evaluated the early pathological changes and mucosal immune responses during Av. paragallinarum infection in the nasal turbinates of chicken. Furthermore, the use of Japanese quail as an alternate experimental animal model than chicken in IC remain unexplored. Here, we examined clinical signs, gross and histopathological changes at the nasal turbinates following experimental Av. paragallinarum infection in chicken and Japanese quail. MethodsWe developed a comprehensive scoring system for recording gross and histopathologic lesions during infection. ResultsOur data show that chicken have a higher susceptibility to Av.paragallinarum infection than the Japanese quail. Japanese quail had significantly lower gross as well as histopathology score in nasal turbinates as compared to infected chicken. Importantly, chicken at an early age i.e. 2.5 weeks were able to induce mucosal immune responses against Av. paragallinarum infection. ConclusionOur findings suggest that there are demonstrable differences in the disease pathology and host immune response to Av. paragallinarum infection in chicken and Japanese quail and warrant further investigation for the use of Japanese quail as an animal model for IC.

scholarly journals Experimental re-infected cats do not transmit SARS-CoV-2

2021 ◽  
Author(s):  
Natasha N. Gaudreault ◽  
Mariano Carossino ◽  
Igor Morozov ◽  
Jessie D. Trujillo ◽  
David A. Meekins ◽  
...  
Keyword(s):  
Immune Responses ◽  
Respiratory Tract ◽  
Clinical Signs ◽  
Viral Rna ◽  
Lymphoid Tissues ◽  
Upper Respiratory Tract ◽  
Post Secondary ◽  
Secondary Challenge ◽  
Global Pandemic ◽  
Upper Respiratory

AbstractSARS-CoV-2 is the causative agent of COVID-19 and responsible for the current global pandemic. We and others have previously demonstrated that cats are susceptible to SARS-CoV-2 infection and can efficiently transmit the virus to naïve cats. Here, we address whether cats previously exposed to SARS-CoV-2 can be re-infected with SARS-CoV-2. In two independent studies, SARS-CoV-2-infected cats were re-challenged with SARS-CoV-2 at 21 days post primary challenge (DPC) and necropsies performed at 4, 7 and 14 days post-secondary challenge (DP2C). Sentinels were co-mingled with the re-challenged cats at 1 DP2C. Clinical signs were recorded, and nasal, oropharyngeal, and rectal swabs, blood, and serum were collected and tissues examined for histologic lesions. Viral RNA was transiently shed via the nasal, oropharyngeal and rectal cavities of the re-challenged cats. Viral RNA was detected in various tissues of re-challenged cats euthanized at 4 DP2C, mainly in the upper respiratory tract and lymphoid tissues, but less frequently and at lower levels in the lower respiratory tract when compared to primary SARS-CoV-2 challenged cats at 4 DPC. Histologic lesions that characterized primary SARS-CoV-2 infected cats at 4 DPC were absent in the re-challenged cats. Naïve sentinels co-housed with the re-challenged cats did not shed virus or seroconvert. Together, our results indicate that cats previously infected with SARS-CoV-2 can be experimentally re-infected with SARS-CoV-2; however, the levels of virus shed was insufficient for transmission to co-housed naïve sentinels. We conclude that SARS-CoV-2 infection in cats induces immune responses that provide partial, non-sterilizing immune protection against reinfection.

scholarly journals Otitis and meningoencephalitis associated with infectious coryza (Avibacterium paragallinarum) in commercial broiler chickens

2018 ◽  
Vol 30 (5) ◽  
pp. 784-788 ◽  
Author(s):  
Manuela Crispo ◽  
C. Gabriel Sentíes-Cué ◽  
George L. Cooper ◽  
Grace Mountainspring ◽  
Charles Corsiglia ◽  
...  
Keyword(s):  
Broiler Chickens ◽  
Animal Health ◽  
Clinical Signs ◽  
Economic Losses ◽  
Laboratory System ◽  
Sequencing Analysis ◽  
Contributing Factors ◽  
Infectious Coryza ◽  
Avibacterium Paragallinarum ◽  
Commercial Broiler

Infectious coryza, caused by Avibacterium paragallinarum, is an acute respiratory disease of poultry that can result in substantial morbidity, mortality, and economic losses. In March 2017, the Turlock branch of the California Animal Health and Food Safety laboratory system encountered an unusual clinical and pathologic presentation of infectious coryza in 6 live, 29-d-old, commercial broiler chickens that were submitted for diagnostic investigation. Antemortem evaluation revealed severe neurologic signs, including disorientation, torticollis, and opisthotonos. Swollen head–like syndrome and sinusitis were also present. Histologically, severe sinusitis, cranial osteomyelitis, otitis media and interna, and meningoencephalitis were noted, explaining the clinical signs described. A. paragallinarum was readily isolated from the upper and lower respiratory tract, brain, and cranial bones. Infectious bronchitis virus (IBV) was also detected by PCR, and IBV was isolated in embryonated chicken eggs. Based on sequencing analysis, the IBV appeared 99% homologous to strain CA1737. A synergistic effect between A. paragallinarum and IBV, resulting in exacerbation of clinical signs and increased mortality, may have occurred in this case. A. paragallinarum should be considered among the possible causes of neurologic signs in chickens. Appropriate media should be used for bacterial isolation, and the role of additional contributing factors and/or complicating agents should be investigated in cases of infectious coryza.

scholarly journals Silent Mastoiditis Associated with Pneumococcal Meningitis

2021 ◽  
Vol 27 (2) ◽  
pp. 1-6
Author(s):  
Ashikin Mohd Nordin ◽  
Jean Jun Ong ◽  
Juriza Ismail ◽  
Norazlin Kamal Nor ◽  
Sau Wei Wong ◽  
...  
Keyword(s):  
Brain Imaging ◽  
Pneumococcal Meningitis ◽  
Wide Spectrum ◽  
Clinical Signs ◽  
Invasive Disease ◽  
Upper Respiratory Tract ◽  
Slow Recovery ◽  
Acute Mastoiditis ◽  
Focus Of Infection ◽  
Upper Respiratory

Streptococcus pneumoniae (S pneumoniae) can cause a wide spectrum of diseases which includes upper respiratory tract infection as well as more severe invasive disease such as meningitis. Meningitis may be caused by invasion of the organism through the blood brain barrier, either via haematological spread or from an adjacent focus of infection such as the ears. We describe two infants with pneumococcal meningitis and silent mastoiditis. They both presented with a classical history to suggest meningitis with no apparent focus of infection. A brain imaging was done in the first infant to look for the underlying cause of his focal seizure and in the second infant, to assess for complications of meningitis, as he had a slow recovery. While they did not have any clinical signs to point towards the diagnosis, they were both diagnosed to have acute mastoiditis from brain imaging. We would like to highlight the importance of brain imaging in excluding silent mastoiditis in infants with meningitis, particularly in those whose clinical course appears atypical.

scholarly journals Modelling upper respiratory viral load dynamics of SARS-CoV-2

BMC Medicine ◽  
2022 ◽  
Vol 20 (1) ◽  
Author(s):  
Joseph D. Challenger ◽  
Cher Y. Foo ◽  
Yue Wu ◽  
Ada W. C. Yan ◽  
Mahdi Moradi Marjaneh ◽  
...  
Keyword(s):  
Viral Load ◽  
Immune Responses ◽  
Mechanistic Model ◽  
Severity Of Illness ◽  
Upper Respiratory Tract ◽  
Neutralising Antibodies ◽  
Immune Mediated ◽  
Peak Viral Load ◽  
Upper Respiratory ◽  
Serial Measurements

AbstractRelationships between viral load, severity of illness, and transmissibility of virus are fundamental to understanding pathogenesis and devising better therapeutic and prevention strategies for COVID-19. Here we present within-host modelling of viral load dynamics observed in the upper respiratory tract (URT), drawing upon 2172 serial measurements from 605 subjects, collected from 17 different studies. We developed a mechanistic model to describe viral load dynamics and host response and contrast this with simpler mixed-effects regression analysis of peak viral load and its subsequent decline. We observed wide variation in URT viral load between individuals, over 5 orders of magnitude, at any given point in time since symptom onset. This variation was not explained by age, sex, or severity of illness, and these variables were not associated with the modelled early or late phases of immune-mediated control of viral load. We explored the application of the mechanistic model to identify measured immune responses associated with the control of the viral load. Neutralising antibodies correlated strongly with modelled immune-mediated control of viral load amongst subjects who produced neutralising antibodies. Our models can be used to identify host and viral factors which control URT viral load dynamics, informing future treatment and transmission blocking interventions.

scholarly journals An outbreak of SARS-CoV-2 with high mortality in mink (Neovison vison) on multiple Utah farms

2021 ◽  
Author(s):  
Chrissy Eckstrand ◽  
Tom Baldwin ◽  
Mia Kim Torchetti ◽  
Mary Lea Killian ◽  
Kerry A Rood ◽  
...  
Keyword(s):  
Respiratory Tract ◽  
Clinical Signs ◽  
Viral Transmission ◽  
Viral Rna ◽  
Upper Respiratory Tract ◽  
Tracheobronchial Lymph Node ◽  
Multiple Organs ◽  
Upper Respiratory ◽  
Polymerase Chain

The breadth of animal hosts that are susceptible to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and may serve as reservoirs for continued viral transmission are not known entirely. In August 2020, an outbreak of SARS-CoV-2 occurred in multiple mink farms in Utah and was associated with high mink mortality and rapid viral transmission between animals. The outbreak's epidemiology, pathology, molecular characterization, and tissue distribution of virus within infected mink is provided. Infection of mink was likely by reverse zoonosis. Once established, infection spread rapidly between independently housed animals and farms, and caused severe respiratory disease and death. Clinical signs were most notably sudden death, anorexia, and increased respiratory effort. Gross pathology examination revealed severe pulmonary congestion and edema. Microscopically there was pulmonary edema with moderate vasculitis, perivasculitis, and fibrinous interstitial pneumonia. Reverse transcriptase polymerase chain reaction (RT-PCR) of tissues collected at necropsy demonstrated the presence of SARS-CoV-2 viral RNA in multiple organs including nasal turbinates, lung, tracheobronchial lymph node, epithelial surfaces, and others. Whole genome sequencing from multiple mink was consistent with published SARS-CoV-2 genomes with few polymorphisms. The Utah mink SARS-CoV-2 strain fell into Clade GH, which is unique among mink and other animal strains sequenced to date and did not share other spike RBD mutations Y453F and F486L found in mink. Localization of viral RNA by in situ hybridization revealed a more localized infection, particularly of the upper respiratory tract. Mink in the outbreak reported herein had high levels of virus in the upper respiratory tract associated with mink-to-mink transmission in a confined housing environment and were particularly susceptible to disease and death due to SARS-CoV-2 infection.

scholarly journals Effects of famciclovir in cats with spontaneous acute upper respiratory tract disease

2019 ◽  
Vol 22 (6) ◽  
pp. 492-499
Author(s):  
Lucy Kopecny ◽  
David J Maggs ◽  
Christian M Leutenegger ◽  
Lynelle R Johnson
Keyword(s):  
Respiratory Tract ◽  
Clinical Signs ◽  
Response To Therapy ◽  
Study Entry ◽  
Upper Respiratory Tract ◽  
Respiratory Tract Disease ◽  
Upper Respiratory ◽  
Upper Respiratory Tract Disease ◽  
Tract Disease ◽  
Group D

Objectives The aim of this study was to assess the effects of famciclovir administration in cats with spontaneously acquired acute upper respiratory tract disease. Methods Twenty-four kittens with clinical signs of acute upper respiratory tract disease were randomly allocated to receive doxycycline (5 mg/kg PO q12h) alone (group D; n = 12) or with famciclovir (90 mg/kg PO q12h; group DF; n = 12) for up to 3 weeks. Clinical disease severity was scored at study entry and daily thereafter. Oculo-oropharyngeal swabs collected at study entry and exit were assessed using quantitative PCR for nucleic acids of feline herpesvirus type 1 (FHV-1), feline calicivirus (FCV), Chlamydia felis, Bordetella bronchiseptica and Mycoplasma felis. Results The median (range) age of cats was 1.5 (1–6) months in group D vs 1.6 (1–5) months in group DF ( P = 0.54). Pathogens detected in oculo-oropharyngeal swabs at study entry included FCV (n = 13/24; 54%), M felis (n = 8/24; 33%), FHV-1 (n = 7/24; 29 %), C felis (n = 7/24; 29%) and B bronchiseptica (n = 3/24; 12%). Median (range) duration of clinical signs was 11.5 (3–21) days in group DF and 11 (3–21) days in group D ( P = 0.75). Median (range) total disease score at the end of the study did not differ between groups (group D 1 [1–1] vs group DF 1 [1–3]; P = 0.08). Conclusions and relevance This study revealed no significant difference in response to therapy between cats treated with doxycycline alone or with famciclovir; cats improved rapidly in both groups. However, identification of FHV-1 DNA was relatively uncommon in this study and clinical trials focused on FHV-1-infected cats are warranted to better evaluate famciclovir efficacy.

scholarly journals A transient increase in MHC-IIlow monocytes after experimental infection with Avibacterium paragallinarum (serovar B-1) in SPF chickens

2020 ◽  
Vol 51 (1) ◽  
Author(s):  
Karla Lucía F. Alvarez ◽  
Astrid Poma-Acevedo ◽  
Manolo Fernández-Díaz
Keyword(s):  
Immune Response ◽  
Large Body ◽  
Clinical Signs ◽  
Clinical Manifestations ◽  
Nasal Discharge ◽  
High Morbidity ◽  
Upper Respiratory Tract ◽  
Secondary Infections ◽  
Avibacterium Paragallinarum ◽  
Facial Swelling

Abstract Infectious coryza (IC), an upper respiratory tract disease affecting chickens, is caused by Avibacterium paragallinarum. The clinical manifestations of IC include nasal discharge, facial swelling, and lacrimation. This acute disease results in high morbidity and low mortality, while the course of the disease is prolonged and mortality rates are increased in cases with secondary infections. Studies regarding the immune response in infected chickens are scarce, and the local immune response is the focal point of investigation. However, a large body of work has demonstrated that severe infections can impact the systemic immune response. The objective of this study was to evaluate the systemic effects of Avibacterium paragallinarum (serovar B-1) infection on immune cells in specific pathogen-free (SPF) chickens. The current study revealed the presence of a transient circulating monocyte population endowed with high phagocytic ability and clear downregulation of major histocompatibility complex class II (MHC-II) surface expression. In human and mouse studies, this monocyte population (identified as tolerant monocytes) has been correlated with a dysfunctional immune response, increasing the risk of secondary infections and mortality. Consistent with this dysfunctional immune response, we demonstrate that B cells from infected chickens produced fewer antibodies than those from control chickens. Moreover, T cells isolated from the peripheral blood of infected chickens had a lower ability to proliferate in response to concanavalin A than those isolated from control chickens. These findings could be related to the severe clinical signs observed in complicated IC caused by the presence of secondary infections.

Sinusitis in Infants and Children

1992 ◽  
Vol 101 (1_suppl) ◽  
pp. 37-41 ◽  
Author(s):  
Ellen R. Wald
Keyword(s):  
Respiratory Tract ◽  
Maxillary Sinusitis ◽  
Bacterial Species ◽  
Clinical Signs ◽  
Signs And Symptoms ◽  
Clinical Problem ◽  
Nasal Discharge ◽  
Upper Respiratory Tract ◽  
Radiographic Findings ◽  
Upper Respiratory

The major clinical problem in considering a diagnosis of sinusitis is differentiating uncomplicated upper respiratory tract infection from a secondary bacterial infection of the paranasal sinuses that may benefit from antimicrobial therapy. A diagnosis of sinusitis is suggested by presentation with protracted upper respiratory tract symptoms or a cold that is more severe than usual with fever and purulent nasal discharge. Confirmatory tests of sinus disease are transillumination (useful in adolescents if interpretation is confined to the extremes — normal or absent); radiographic findings of opacification, mucous membrane thickening, or an air-fluid level; and sinus aspiration (indicated for severe pain, clinical failures, or complicated disease). When clinical signs and symptoms are accompanied by abnormal radiographic findings, bacteria in high colony count are recovered from the maxillary sinus aspirate in 70% of patients. The common bacterial species recovered from children with acute maxillary sinusitis are Streptococcus pneumoniae, Moraxella (Branhamella) catarrhalis, and Hemophilus influenzae.

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